LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>EXERCISES>Q 7

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9th CBSE

IMPORTANT

Earn 100

Although some particles in the nucleus have lost mass, why is it that protons and neutrons do not lose mass?

Important Questions on Structure of the Atom

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>EXERCISES>Q A

Cathode rays are produced when high voltage is applied across a gas under

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>EXERCISES>Q A

Which of the following statements is not correct regarding anode rays?

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>EXERCISES>Q A

The

\frac{e}{m}

ratio of an electron is

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>EXERCISES>Q A

Anode rays were discovered by

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>EXERCISES>Q A

Number of valence electrons in

K

atom is

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>EXERCISES>Q A

The complete symbol of arsenic is ${}_{33}^{75}{As}$ . The number of protons, neutrons and electrons in an atom of arsenic is

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>EXERCISES>Q A

The complete symbol of selenium is

{}_{34}^{79}{Se}

. The number of protons, neutrons and electrons in a selenide ion

({Se}^{2 -})

is

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>EXERCISES>Q A

Isotopes of elements were discovered by